The TiVo Bolt supports 4K video and works great with the Samsung UHD 4K Flat Smart TV- JU6000.
To connect the TiVo Bolt to the Samsung TV, make sure you use the HDMI cable that came with the TiVo Bolt. Some inferior quality HDMI cables will not support the HDMI 2.0 connections between the Bolt and the Samsung TV.
Starting up the TiVo can take a little time so be patient.
Once the TiVo is up and running, go to Setting & Messages -> Audio & Video Settings -> Video Resolution and make sure you change the resolution to 2160p (60fps) to take full advantage of the HDMI 2.0 connection between the Bolt and the Samsung TV.
Once 4K is set up, the TiVo Bolt will upscale any content recorded on your TiVo to 4K, which looks fabulous on the Samsung UHD 4K Flat Smart TV- JU6000.